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https://www.044.eu/en/ihealth-air-wireless-fingertip-pulse-oximeter-with-plethysmograph-and-perfusion-index-on-the-app-measures-blood-oxygen-saturation-perfusion-index-pulse-rate/
iHealth Air Wireless Fingertip Pulse Oximeter with Plethysmograph and Perfusion Index on the App, Measures Blood Oxygen Saturation, Perfusion Index, Pulse Rate